I am conducting adsorption experiments in a liquid medium, and one of my samples showed a decrease in Qe values with an increase in Ce. Has anyone encountered this behavior before? What does it mean? I also couldn't fit the non-linear isotherm models, but using the linear models, it fit better with the Langmuir model, with an R2 of 0.989. Is it reliable to use the non-linear model in this case?
Dear Carlos Murr
First, You must present the experimental conditions you achieved (if you used the same adsorbent mass with different initial concentrations).
The nature of the adsorbent and adsorbate (inorganic or organic
It would be best if you studied a two-parameter isotherm model (non-linear) such as the Langmuir and Freundlich and a three-parameter isotherm model (non-linear) such as the Sip or Toth because the Freundlich model is inappropriate at high concentrations.
Thank you, Dr. S. Kalidhasan
and Aida Fekaouni , for your responses. My experiments were conducted with a fixed adsorbate concentration of 1000 ppm, varying the adsorbent mass. I conducted trials with additional dopings in the material under the same concentrations and obtained consistent results, except for this particular sample (67) that I cannot explain. The adsorbent used is calcium phosphate, and the adsorbate is anionic organic dye.- Badges
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